Posted by Casey on .
x+y=x5
I want to get y alone on one side, so if I subtract x from both sides, what would be x  x?

Algebra 
Steve,
xx=0, so y = 5
whatever value x has, the equation is still true. You cannot solve for y in terms of x, because y is independent of x in this case.
If you have 3=3, then x+3 = x+3 whatever x is.
Here, y = 5, so x+y = x5 whatever x is.